WAGO-I/O-SYSTEM 750
Device Description
23
750-652 Serial Interface RS-232 / RS-485
Manual
Version 1.4.0
3.3
Display Elements
Figure 5: Display Elements
Table 8: Legend for Figure “Display Elements”
LED
Designation
Status
Function
A
Function
Green
Ready for operation and undisturbed internal bus
communication
Red
Not ready for operation or no or disturbed internal bus
communication
B
TxD
(transmit)
OFF
No signal transmission TxD
Green
Signal transmission TxD present
1)
Yellow
I/O module has received XOFF character, the
transmission is inactive
2)
CTS line has fallen, the transmission is inactive
4)
C
RxD
(receive)
OFF
No signal transmission RxD or input open
Green
Signal transmission RxD present
1)
Red
Signal transmission RxD present
1)
, but some characters
received are defective. (parity, data frame or overrun
error has occurred)
3)
D
Transmission
status
OFF
No transmission error
Green
Output buffer is full
Yellow
Input buffer is full (LED lights up if there are more than
2304 characters in the input buffer. LED does not light
up if there are fewer than 2176 characters in the input
buffer)
E
Mode
Green
RS-485 half-duplex, DMX
Yellow
RS-422 full-duplex, data exchange
Red
RS-232
F
Data flow control
OFF
No data flow control
Green
RTS/CTS data flow control active
4)
Yellow
XON/XOFF data flow control active
2)
Red
RTS with lead time and follow-on time is active
5)
G
Data exchange
mode
5)
OFF
Data exchange mode is OFF
5)
Yellow
Data exchange mode is initialized
Green
Data exchange mode is ON
Yellow
flashing
Data exchange mode is ON, but there is no
communication (timeout)
